Drying equipment

Abstract

The hot air emitted from the high-temperature oxidation deodorizer is extremely hot, and introducing this hot air directly into a blower would damage the blower. Furthermore, conventional heat exchanger installation methods result in losses. [Solution] The drying apparatus of the present invention comprises a cylindrical drying tank and a high-temperature oxidation deodorizer for deodorizing waste steam discharged from the drying tank, wherein the waste steam discharged from the drying tank is introduced into the high-temperature oxidation deodorizer, and the high-temperature, high-humidity gas discharged from the high-temperature oxidation deodorizer is introduced into the drying tank, The system is characterized by the placement of a heat exchanger to exchange heat between the hot air coming out of the high-temperature oxidation deodorizer and the hot air coming out of the drying tank, connecting the heat exchanger and the deodorizer with internal piping and external piping that connects the heat exchanger and the deodorizer to the high-temperature oxidation deodorizer, and providing a first external piping that introduces the lowered-temperature hot air to a blower and a second internal piping that introduces the raised-temperature hot air into the high-temperature oxidation deodorizer.

Description

Technical Field

[0004]

[0001] The present invention relates to an apparatus for drying (or carbonizing) wastes such as factory sludge, dewatered cake, sludge, sewage, leachate, plating waste liquid, heavy metal waste liquid, slurry, food waste, etc.

Background Art

[0002] In a drying apparatus having a cylindrical drying tank and a high-temperature oxidation deodorizing furnace for deodorizing waste steam discharged from the drying tank, the waste steam discharged from the drying tank is introduced into the high-temperature oxidation deodorizing furnace from above, and the high-temperature and high-humidity gas discharged from the lower part of the high-temperature oxidation deodorizing furnace is introduced into the drying tank. There is a drying apparatus characterized by this.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since the hot air coming out of the high-temperature oxidation deodorizing furnace is at a high temperature, if this hot air is directly introduced into the blower, the blower will be damaged. Also, in the conventional method of installing the heat exchanger, there are losses.

Means for Solving the Problems

[0005] <OO00032>The drying apparatus of the present invention has a cylindrical drying tank and a high-temperature oxidation deodorizing furnace for deodorizing waste steam discharged from the drying tank, and the waste steam discharged from the drying tank is introduced into the high-temperature oxidation deodorizing furnace, and the high-temperature and high-humidity gas discharged from the high-temperature oxidation deodorizing furnace is introduced into the drying tank. It is a drying apparatus, The system is characterized by comprising a heat exchanger that exchanges heat between the hot air discharged from the high-temperature oxidation deodorizer and the hot air discharged from the drying tank, an internal piping that connects the heat exchanger and the high-temperature oxidation deodorizer, and an external piping that connects the heat exchanger and the high-temperature oxidation deodorizer, and by enabling the introduction of cooled hot air into a blower and heated hot air into the high-temperature oxidation deodorizer. [Effects of the Invention]

[0006] According to the drying apparatus of the present invention, the hot air coming out of the high-temperature oxidation deodorizing furnace and the hot air coming out of the drying tank are heat-exchanged in a heat exchanger, the lowered temperature hot air is introduced into the blower, and the raised temperature hot air is introduced into the high-temperature oxidation deodorizing furnace. As a result, the blower is not damaged, there is no loss at the heat exchanger mounting part, and the thermal efficiency is good. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic diagram of the drying apparatus of the present invention, where (a) is a horizontal cross-sectional view and (b) is a vertical cross-sectional view. [Figure 2] This is a schematic diagram of a drying apparatus that does not use ceramic radiant tubes, where (a) is a horizontal cross-sectional view and (b) is a vertical cross-sectional view. [Modes for carrying out the invention]

[0008] The drying apparatus of the present invention will be described in detail based on examples. Because the hot air emitted from the high-temperature oxidation deodorizer is at a high temperature, introducing this hot air directly into the blower would damage the blower. Also, introducing the waste steam from the drying tank directly into the high-temperature oxidation deodorizer would reduce thermal efficiency. Therefore, the following approach was adopted. Note that the following examples show one embodiment of the drying apparatus of the present invention, and the configuration of the drying apparatus of the present invention is not limited to this.

[0009] Figure 1 is a schematic diagram showing one embodiment of the drying apparatus of the present invention, where (a) is a horizontal cross-sectional view and (b) is a vertical cross-sectional view.

[0010] The drying apparatus (100) of the present invention is a new method in which a heat exchanger (132) is arranged to exchange heat between the hot air coming out of the high-temperature oxidation deodorizer and the hot air coming out of the drying tank, and an internal pipe (133) that connects the heat exchanger and the deodorizer is connected to the high-temperature oxidation deodorizer. An external pipe (134) that connects the heat exchanger and the deodorizer is connected to the high-temperature oxidation deodorizer, and a first external pipe that introduces the lowered-temperature hot air to the blower and a second internal pipe that introduces the raised-temperature hot air to the high-temperature oxidation deodorizer are provided, so that the blower is not damaged and the thermal efficiency is good. Furthermore, the walls (heat transfer surfaces) (120A) of the high-temperature oxidation deodorizer (103) use ceramic RT (radiant tube) (120) that can withstand high temperatures.

[0011] The system comprises a cylindrical drying tank (105) and a high-temperature oxidizing broiler (103) for deodorizing waste steam (131) discharged from the drying tank (105). High-temperature, high-humidity gas discharged from the bottom of the high-temperature oxidizing broiler (103) is introduced into the drying tank (105) via a blower (109). The drying tank (105) has a rotating hoisting vane (108) that rotates around a rotating shaft (107) by a drive motor (111). The material to be dried is dried by being struck against this wall by the rotating hoisting vane (108) using centrifugal force. The wall of the high-temperature oxidizing broiler (103) can be used as a heat transfer surface (120A) using ceramic RT (120), efficiently transferring heat into the jacket (106). The material to be dried is dried by being struck against this wall by the rotating hoisting vane (108) using centrifugal force. Furthermore, a pipe (115) that introduces waste steam (131) discharged from the drying tank (105) into the high-temperature oxidation deodorizer (103) is installed between the ceiling of the drying tank (105) and the top of the high-temperature oxidation deodorizer (103), and a return pipe (104) introduces high-temperature, high-humidity gas discharged from the bottom of the high-temperature oxidation deodorizer (103) into the bottom of the drying tank (105), thus increasing the drying speed and efficiency. In addition, the use of ceramic RT (120) on the heat transfer surface (120A) allows it to withstand high temperatures. Ceramic materials are used in the parts of the heat exchanger where structural transformation occurs (including the joints). Since ceramic radiant tubes can crack if water droplets come into contact with them, preheating is performed when the device is temporarily stopped, and when it is completely stopped, a blower (109)(110) is used to bring the temperature of all parts of the drying device to the same level as the outside of the drying device to prevent condensation.

[0012] Furthermore, by making the outer surface of the side wall of the deodorizer a fin with a textured surface, it became possible to increase the surface area of ​​the heat transfer surface, resulting in an improvement of approximately 10% in thermal efficiency. Improvements in performance can also be expected by applying a textured fin to the mounting portion of the heat exchanger. Similarly, improvements in performance can be expected by applying a textured fin to the heat transfer surface of the drying tank.

[0013] In this high-temperature oxidation deodorizer, a new high-efficiency deodorizer using ceramic radiant tubes enables heat exchange at the joint between the deodorizer and the heat exchanger. This makes the heat exchange in the heat exchanger more efficient, resulting in an unprecedentedly high heat exchange efficiency for this deodorizer and heat exchanger set. Because the ceramic radiant tubes efficiently conduct heat to the jacket on the heat transfer surface, the heat exchanger is used more efficiently. This is because if the heat transfer surface of the bottom of the pot is increased by 3.5 times, the evaporation rate increases by 30%. In other words, the hot air entering the heat exchanger uses gas heated on the heat transfer surface, so the heat exchanger is used more efficiently.

[0014] Figure 2 shows a second example in a high-temperature oxidation deodorizer (103) where ceramic radiant tubes are not used due to their high cost. As is clear from Figure 2, the heat exchanger is mounted in a way that maximizes heat exchange efficiency. Even with this configuration, heat exchange is possible without any problems, and it is as effective as in the first embodiment. [Explanation of symbols]

[0015] 103... High-temperature oxidation deodorizer 104... Return piping 105 ··· drying tank 106 ··· jacket 107 ··· rotating shaft 108 ··· rotary lifting blade 109 ··· hot air circulation blower 110 ··· dilution blower 111 ··· drive motor 115 ··· pipe 120 ··· ceramic radiant tube 120A ··· heat transfer surface of RT 131 ··· waste steam 132 ··· heat exchanger 133 ··· internal pipe joining the heat exchanger and the deodorization furnace 134 ··· external pipe joining the heat exchanger and the deodorization furnace

Claims

1. A drying apparatus comprising a cylindrical drying tank and a high-temperature oxidation deodorizer for deodorizing waste steam discharged from the drying tank, wherein waste steam discharged from the drying tank is introduced into the high-temperature oxidation deodorizer, and high-temperature, high-humidity gas discharged from the high-temperature oxidation deodorizer is introduced into the drying tank, A drying apparatus characterized by comprising a heat exchanger that exchanges heat between the hot air discharged from the high-temperature oxidation deodorizer and the hot air discharged from the drying tank, an internal piping that connects the heat exchanger and the high-temperature oxidation deodorizer, and an external piping that connects the heat exchanger and the high-temperature oxidation deodorizer, wherein the apparatus can introduce the lowered-temperature hot air into a blower and the raised-temperature hot air into the high-temperature oxidation deodorizer.

2. The drying apparatus according to claim 1, characterized in that the high-temperature oxidation deodorizing furnace has a furnace body made of ceramic radiant tubes and a jacket housing the front furnace body, and the internal piping is connected to the furnace body.

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